Re: [PATCH] xfs_quota: remove calls to XFS_QSYNC

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

On Wed, Feb 01, 2012 at 08:01:10AM +1100, Dave Chinner wrote:
> So effectively what that says to me is that quota only exports the
> real block usage, even though it internally tracks delalloc
> reservations. Perhaps an additionaly change to make in this case is
> to fold the reserved blocks into what is reported to the quota
> utilities?
> 
> Indeed, what is exported to userspace via xfs_qm_export_dquot() is
> the information in the dquot core - the on-disk information - so
> perhaps all we need to do is export dqp->q_res_bcount (the count of
> real + reserved blocks) instead of the on-disk info?

That seems like a good idea, given that enforcement takes the
reservation into account.  To retain compatbility for the case of new
userspace and an old kernel I'd have to disable Q_XQUOTASYNC in the
kernel intead of in the tool, though.